Loan: Accept abbreviations of "year"

These queries should be accepted:
loan 400000 4.5% 15yr
loan 400000 4.5% 15yrs
loan 400000 4.5% 15 yr
loan 400000 4.5% 15 yrs
loan 400000 4.5% 15 year
loan 400000 4.5% 15 years